gonzo

I have both and go back and forth which one I like better. I ride 95% MX and maybe alittle trail here and there. I personally would go with the 250F. It's easier to manuver and has a ton of power for it size when get to the big stuff. Also it wont wear you out when your riding for 3 hours like a 450 will.

As for weight the 450 is alot lighter than the 426 was. I went from a 400 to a 450. Big difference. 15lbs. As for the starting I never had a problem with any of three that I have owned except for the 400 just before I sold it and it was ignition related.